Document 2Zq56256JDb0Zqba6oKEado6

HUBB-G86978G References tv Recent Literature - 6 r:3.6Jf. Accentuation of the pulmonic second sound and the presence of marked cyanosis suggest cardiac involvement ir. pneumoconiosis. In 43 cases examined by electro-cardiograms, 37.2 por cent showed right axis deviation which paralleled the autopsy evidenco of right ventricular hypertrophy. Ccnjestivc heart failure was a ccrar.cn cause of death in third stage silicotics, mere common in this serios oo of cases than tuberculosis, end the findings aro in disagreement with the popular concept. 24 SILICOSIS AND SILICO-TUBERC'JLOSIS. F. Donenlci. Folia med. j>4, 289-305 (1938). (2_b (Italian). The sutler presents the clinical picture and autopsy findings of a powder factory worker wno died of silico-tuberculosis. On the basis cf tha literature ho con cludes that silicosis ar.d tuberculosis aro separate diseases but that they appoer 0, together quite frequently, 25 THE ENVIRONMENT FACTOR IN RELATION TO RICH NEGRO TUBERCULOSIS RATES. R.B. Roth. Am. Rev, Tuberc. 38, 137-204 (August 1938). The author reviews the differonco in mortality rates between whites and negroos 3nd discussoa the views of several authors on the explanation. It is held by some that environment and mental attitude are the doterminative factors while others havo the opposite view that negrees are more susceptible to the disease. In this discussion, the author presents a study of groups of negroes and whites living in comparable conditions in American enlisted forces. Ho bolieves that the environmental factors are minimized because cost of the whltos come fron the lower economic brackots and the medical cntranco examinations ore the same. A great disparity in rates was found: 0.24 per 1000 for whites and 0.99 per 1000 for negroes or about 1 to 4, which ho cays, could not be oxplninod except by differences in susceptibility. At the same time, he does not wish to minimize the environmental factor. 26 INCIDENCE OF PULMONARY TUBERCULOSIS IN MINERS. J, Am. Med. Assoc. (Paris Letter 111. 1482 (1938). Two doctors report on a study of tuberculosis among cool minors from 1923-37. Among patients in a coal nino company-owned hospital, often one-half of the patients were suffering from pulmonary tuberculosis. In the ycarB 1923-37, 28.6 per cent of tho hospital deaths were caused by this disease compared to 16.5 per cent for n group of controls of tho Bamo ago* The 1936 mortality rate for the same district for all non-mining males was 2.4 per 1000 and for coal miners was 3.4 per 1000, 27 TUBERCULOSIS IN RELATION TO THE PNEUMOCONIOSES. J.V. Sparks. J. Roy. Inst. Publ. Health & Hyg. 1, 790-7 (October 1938)., (British). The paper discusses tho radiological aspects of tho subject. It is nearly im possible to recognize with certainty the ante-primary stage of silicosis without the aid of the preliminary film of tho same pationt. It is difficult to express an opinion on the question of superimposed tuberculosis in the pnouaooonloses fre radiologic studies. The new method of tomography may yield further help to tho clinician in defining the presence and oxtent of nodulation in silicosis. 28 THE CONTROL AND CALIBRATION OF ROENTGENOORAPHIC APPARATUS. Charles Weyl, S. Rei-. Warren, Jr., and D.B. O'Neill, Am. J, Roontg. & Rad, Thor. 2, 741-58 (November 1938). The problem of standardizing roontgcnographic technique involves the accurate specification and reproduction of technique. Methods for the fulfillment of these requirements arc: (1) Precise control of apparatus and procedure, (2) accurate calibration of technical factors, and (S) use of an aluminum ladder to (